7.8
HIGH
CVSS 3.1
CVE-2026-72126
can: isotp: use unconditional synchronize_rcu() in isotp_release()
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket. sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path.
Details
INFO
Published Date :
Aug. 15, 2026, 6:21 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
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for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Ensure synchronize_rcu() is called before timer cancellation to prevent use-after-free.
- Always call synchronize_rcu() before cancelling timers.
- Update the Linux kernel to the resolved version.
- Review related socket and timer handling logic.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72126.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72126 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72126
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72126 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72126 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '22bfa94db2ef6900c790884fa9461486516626e9', 'lessThan': '945d9894502cd9124f5d676181c542ed2000f7c0', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '59672aa4bcd8d32172c1ff6a179583981d6acabc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '15413a082df69175c2f96aeab4c26fe1ff7cff03', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '6280eda96e0707264849fa7d036fed873c1f8a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'cb6abc584a1bfab107ac003d64948a4aef1730aa', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b88a511308779c225005d7994b8744561bdbafbc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b8278ff605187ef3fa0f2705e93251cce4c4f8ee', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '9b1a02e0d980ac6b0e36a90378f847062f81d7e4', 'versionType': 'git'}, {'status': 'affected', 'version': '80c6ddf771df2ef786f28c1ca5919b3f1080091b', 'versionType': 'git'}, {'status': 'affected', 'version': 'ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.50', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.12.17', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.13.2', 'lessThan': '5.14', 'versionType': 'semver'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '22bfa94db2ef6900c790884fa9461486516626e9', 'lessThan': '945d9894502cd9124f5d676181c542ed2000f7c0', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '59672aa4bcd8d32172c1ff6a179583981d6acabc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '15413a082df69175c2f96aeab4c26fe1ff7cff03', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '6280eda96e0707264849fa7d036fed873c1f8a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'cb6abc584a1bfab107ac003d64948a4aef1730aa', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b88a511308779c225005d7994b8744561bdbafbc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b8278ff605187ef3fa0f2705e93251cce4c4f8ee', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '9b1a02e0d980ac6b0e36a90378f847062f81d7e4', 'versionType': 'git'}, {'status': 'affected', 'version': '80c6ddf771df2ef786f28c1ca5919b3f1080091b', 'versionType': 'git'}, {'status': 'affected', 'version': 'ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.50', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.12.17', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.13.2', 'lessThan': '5.14', 'versionType': 'semver'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '22bfa94db2ef6900c790884fa9461486516626e9', 'lessThan': '945d9894502cd9124f5d676181c542ed2000f7c0', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '59672aa4bcd8d32172c1ff6a179583981d6acabc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '15413a082df69175c2f96aeab4c26fe1ff7cff03', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '6280eda96e0707264849fa7d036fed873c1f8a6d', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'cb6abc584a1bfab107ac003d64948a4aef1730aa', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b88a511308779c225005d7994b8744561bdbafbc', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': 'b8278ff605187ef3fa0f2705e93251cce4c4f8ee', 'versionType': 'git'}, {'status': 'affected', 'version': '14a4696bc3118ba49da28f79280e1d55603aa737', 'lessThan': '9b1a02e0d980ac6b0e36a90378f847062f81d7e4', 'versionType': 'git'}, {'status': 'affected', 'version': '80c6ddf771df2ef786f28c1ca5919b3f1080091b', 'versionType': 'git'}, {'status': 'affected', 'version': 'ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f', 'versionType': 'git'}, {'status': 'affected', 'version': '5.10.50', 'lessThan': '5.10.261', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.12.17', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.13.2', 'lessThan': '5.14', 'versionType': 'semver'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/can/isotp.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket. sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path. Added Reference https://git.kernel.org/stable/c/15413a082df69175c2f96aeab4c26fe1ff7cff03 Added Reference https://git.kernel.org/stable/c/59672aa4bcd8d32172c1ff6a179583981d6acabc Added Reference https://git.kernel.org/stable/c/6280eda96e0707264849fa7d036fed873c1f8a6d Added Reference https://git.kernel.org/stable/c/945d9894502cd9124f5d676181c542ed2000f7c0 Added Reference https://git.kernel.org/stable/c/9b1a02e0d980ac6b0e36a90378f847062f81d7e4 Added Reference https://git.kernel.org/stable/c/b8278ff605187ef3fa0f2705e93251cce4c4f8ee Added Reference https://git.kernel.org/stable/c/b88a511308779c225005d7994b8744561bdbafbc Added Reference https://git.kernel.org/stable/c/cb6abc584a1bfab107ac003d64948a4aef1730aa
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.